Which of Newton's laws best explains why motoris 7y,)w9diag*v3 ryg mwts should buckle-up?

  When you sit on a chaixty k3+a( kpab9v:vl ;r, the resultant force on you is

  In the absence of an external forco,zr1p(z 1s.ioto -s me, a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly cwe7l3z56jxbe hr: m4j(-uxfturned off, while traveling in empty space, the starwux4r e (7m hz6 l-5jb:x3fjceship will

  A rocket moves through empty space in a straight line with czd9um1cqw ihhrko.*439k (vf onstant speed. It is dvc.fk9zwh*u rq1ko 3(i94mhfar from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to the rocket in order to sustain its motion is

  You are standing in a moving gk7 gpu7-lfi2tqr,.(eavj2v bus, facing forward, and you suddenly fall forward. gjtve7vp2.q au(gl f,72i- kr You can imply from this that the bus's

  You are standing in a moving bus, facing ;r. ,yjc+jctu 1v5,k:uylzg lforward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you to falluy ;,,1r :uktlcjzv cl+ yjg5. forward?

  A constant net force acts on an object. Describe the motion of the u )v :jl*bz v389unmdhobject.

  The acceleration of an object is+ozyx)sny.s.cv)9zpn + l z04h 9fhcv inversely proportional to

  A net force F accelerates a mass m with an acceleration a(7n99fa j5gle(zct)cuniu(aw l +m p4. If the same net force is applied to mass 2m, then the acceler g t4cml z(()u +fn9ewp(ani5c9ulja7ation will be

  A net force F acts on a mass m anfezhe6xv2 +i;lz*0a a .q dn6xd produces an acceleration a. What acceleration results if a net forcex.z eq6 ezdnvxf;+h26l 0 iaa* 2F acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will fly away. hf0c jic1g.clm2h69d This is an ildh clm2chf.j690c1 iglustration of

  Two cars collide head-on. At every moment during the cog9edv q, rp(ms sz9o+/llision, the magnitude of the force the first car exerts on the second is exactly equa(z s+sp99rge/dom qv,l to the magnitude of the force the second car exerts on the first. This is an example of

  If you exert a force F on an object, the force which the objectqknj-ox3c80c exerts on you willj 38o 0nxcqc-k

  Action-reaction forces1.i o 9 kkw3w2whqcp* fuf)8cjd 11zpy

  Action-reaction forcevmt78cwgnq o)t, -v;ls are

  A 20-ton truck collides with a 1500-i4/i3l/twyumuo10y.5gh w0i cm 3 m rmlb car and causes a lot of damage to the car. Since a lot of damage i3m /wmwu ium4h/.yg 30 ml0y tcr15oiis done on the car

  An object of mass m sits on a flat table. The Earth pulls on this 4 2,igkh ef1z,wkq 1kl jyw4f(object with force mg, which we kwlze, f gjw1kkq(i4f12 4hy,will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means of a string. The Ea2wpocvo1ok 0 a88x8serth pulls downward on the toy with its weight force of 8.0 N. If this is the "aacokoe81os 2pwv 8x80 ction force," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500-N instantaneous force. T3 4q 1pbg6tfrtneb6e7 cq4;s8s)kc rkk6 bw; bhe ball hits the bat with anbftb1ekt7g s8 ;wk43)pskbc6 ecq4r6bq; n r6 instantaneous force, whose magnitude is

State Newton's three lt2zw7d rh2qt/aws.

  Mass and weight

  The acceleration due to gravity is lower on the Moon than c3azus 28 oxab0e3i v a.zl.6zon Earth. Which of the folloz6 ulb3zza0i o2. ac.xe8a3svwing is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a distanj7ana;; my7j jce is

  Who has a greater weight to mass lgs4+ wgphu6 qzo)(sa-/l-uf ratio, a person weighing 400 N or a person weighing f+uwog4hq(6 zas-g/ l)-slp u 600 N?

  A stone is thrown straight up. At the top of its papin0 )iok0d:t/h*rj3 n4fu rv th, the net force acting on it isr)k3 fi0d 0huv:4n/pi or*tnj

  A 20-N weight and a 5 j )os(2+p tvoipp51m/h.azvx.0-N weight are dropped simultaneously from the same height. Ignore air 5x ovv+tz.ppj /1h)(oai msp2 resistance. Compare their accelerations.

  A brick and a feather fall to the earth at their respective 2wxyf .k ;nvm*terminal velocities. Which object experiences the greater formv2. fyx kwn*;ce of air friction?

  An object of mass m r:r5 b2t(pnfdis hanging by a string from the ceiling of an elevator. The elevator is moving up at constant speed. What is rr: 5bt(nf2dpthe tension in the string?

  An object of mass m is hanging by a string from t( 40+3g tzzbt1aja rache ceiling of an elevator. The elevator is moving upward, but slowing down.zb (jtz r4a1+agtca03 What is the tension in the string?

  The force that keeps you from sqf z4e*q*gw g6liding on an icy sidewalk is

  It's more difficult to svk tcf9,(pofs ,k(x6 3wk.a istart moving a heavy carton from rest than it is to keep pushing it with constant vekf,px3c6( iw at (skko 9fs,.vlocity, because

  A horizontal force accelg ob p.f7p+vk 2re-k3p7p7szlerates a box from rest across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the horizontal force is doubled. Weo lg+2prvzpkk73 f ps p7-b7.hat happens to the box's acceleration?

  A packing crate slides down an inclined ramp at cohku z7l0f5zyg.d-j gz7uo0 v1nstant velocity. Thus we can dedu5zuyg.j 00kzl1z7dogu hf-v 7ce that

  A block of mass M slides down a frictionless plane inclined at an angle q witlar -l bq 2/pqbmq*u)7h the horizontal. The normal r/*qpmq )u7 blalr-bq2eaction force exerted by the plane on the block is

  A block of mass M slides down a frictioo+s :/mf 1qdzrnless plane inclined at an angle q with the horizontal. The normal reaction force exerted byrsqz: 1/fm+ do the plane on the block is directed

  A block of mass M slides down a frictionless plane inclined at+ w2h,ot;n/vcs.l hi r an angle q with the horizontal. The gravitational force is direchw;t2ls, /+ocvr n. hited

  Two toy cars (16 kg and 2.0 kg) are releasfin/n i sv7/-oed simultaneously on an inclined plane that makes an angle of 30e with tfni nv i-s7/o/he horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. c-wj;9rfr bu6A 16-N force is applied to the object, and it acceleratewj69;f u-bc rrs at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can+abgj*5nut)gs3v h.d accelerate from rest to 27 m/s in 7.0 s. What is the average forwjg* hb5vts.)ugn3d+a ard force on the car?

  Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s79mrz af:g. nue9 1slb. What is the net force ar be9zam:ln 91gu7s. fcting on the body?

  An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 mf2:w5onx6z vuho q19q 4o/x vm/s aftero 4vzx1qfown/o95qv:mxu 26h traveling
90.0 cm down a launching tube. Assuming the rocket was accelerated uniformly, what is the average force acted on it?

  If you push a 4.0-kg mass with the same force that you push a7rz*rakq 9 ek(gx1 xg htmv71: 10-kg mass from restg*m zt1 a71 9xg7(:rhkve rxqk,

  What is the mass of a person who weig7 u.qau) vf4ayup b yw(2l3vd+)5 ztxjhs 110 lb?

  What is the mass of an oj)c5hi.l ndb:dmdy( .bject that weighs 250 N on the surface of the Earth where the accelera)d:.(5 nyhlbi mj cd.dtion due to gravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the ombm 3(v1(exxkd hck5 +bject on the surface of the Moonk(exb3 c5mdvk hm+1(x where the acceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object-zq/7ru-g;kwmdyui rc8; 7d w B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of the objects/ r7g8ww-d- m ;qc d;uriy7zuk.

  Sue and Sean are having a tug-of-war by pulling on opposit( x bxwiq,,r/wffv;6te ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates toward xf6,/ww,qrt;v( if bx Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A force F acts on the 1g .f yz+cbd(dlm 5x ygl:x2ahhx ;,j0stack, g5cm0al ;:dlx(xdh2g yy+.1xh ,bzjf and it accelerates at $3.0 \; m/s^2$. A 1.0 kg book is then added to the stack. The same force is applied, and now the stack accelerates at $2.0 \; m/s^2$. What was the mass of the original stack?

  A person of weight 480 N stands onmyf5/-e ssvf 0 a scale in an elevator. What will the scale be reading when the elevator is acce-/ff50vesysm lerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an eleva8ca j 0uvpmkmz(dmu(n 7ce:n, .ssp60tor. If the mass of the person is 60.0 kg and the elevator acceleratka 8m((v6upness70mzcmj 0.n: pud c,es downward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If the mass of the person qderna6i q,9 7is 60.0 kg and the elevator accelerates upward witqnae q6i9 r7,dh an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal force* p8ho: uptj5(-auvep 8rzw m7s act on a 5.0-kg mass. One force has a magnitude of 8.0 N and is directed due noru5 8:jz8rapw 7th vp( o-ep*umth. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg tqdh,1 pcz +f.rests on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is traveling 15 m/s, what is the minimum stopping distance if the load 1tzq,. cdhfp+is not to slide forward into the cab?

  An object of mass 6000 kg rests on the flatbed of a truck. It is held in place j w /uv jhse7aqri6.54by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is traveling 15 m/s, what is the minimum stopping time if the load is not to slide forward int.u5e7 javi6/jwq hs 4ro the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0pa5x 0 satyzhl0q(8e *.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of the pulpas8xq5z 0 h( 0ay*telley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, k/k+1dlr31v m* eebnn3 8uxh nwhat is the tension in the +hn kdeum8 3ren/x *3lk11n bvstring? (Ignore friction and the mass of the pulley.)

  A student pulls a box of booa hx)lbv .gz2 y)87 ;l0hqkxvkks on a smooth horizontal floor with a force of 100 N in a dirv)k2ll x.zqb8 x7y;h0 vh)kagection of $37^{\circ}$ above the horizontal. If the mass of the box and the books is 40.0 kg, what is the acceleration of the box?

  A student pulls a boz ,0gyw .puhpnw-rj8/n jdj-h(wm 0-hx of books on a smooth horizontal floor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the box and the books is 40.0 kg, what is m, hjg( -pwjhn 0r-zyp08 /wj-nu.wdh the normal force on the box?

  A traffic light of weight 100 N is supported by two ropes as shown in Fi xjx: l3 zaa(0o2g9m +baccb9lg. 4-2. Wcl0aala29 c+xbz: o xg9b(mj 3hat are the tensions in the ropes?

  In Fig. 4-2, if the tension . k.siw:+ojkske5wo/vr3v8x s in the ropes are 50 N, what is the mass of the traffic rwkj v:8/ow. kk. vso+ sx53ielight?

  Two boxes of masses m aue 4 (m)kb1v4 b:l)ruoc1szahnd 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the accl 4 (robcm)uzvas1b:eh 1k)u4 eleration of the more massive box?

  Two boxes of masses m and-) mcz; lcoy+yy74pxx 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the net force on the mozx ;cmy-lx)c+ 4yo7ypre massive box?

  Two boxes of masses m and 2m are connected by a rope. (Ser w)q)tfdy y2p7uqe/. e Fig. 4-4.) If the forward force on the more massive box is F, what is the7)pwfq ryu2y et.dq)/ tension in the connecting rope?

  Two boxes of masses m and 2m az) .ezjon+wqfys1o,y3jr h0*gtu*6 ure connected by a rope. (See Fig. 4-4.) If the forward force on the more massive box is on,yeu j*f6+u*q.rgtsh3zj zowy 1)0 F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as2kyom-g c8 7x5wli )y tdkc8,t shown in Fig. 4-5. Box I oycdy72i ltg 8o8-km)w kt,x5cf mass
8.0 kg rest on the top of the table; the coefficient of kinetic friction between box I and the table is 0.10. Box II has a mass of 15.0 kg.
(a) Draw the free-body diagrams for the two boxes, identifying all of the forces acting on each of the masses.
(b) Calculate the acceleration of the system.
(c) Calculate the tension in the cord.

  The coefficient of stzlfe ir* e6j)v ec)3-datic and kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net forc)36)ce v*ijlfzere - de on the box when a 15 N horizontal force is applied to the box?

  The coefficients of static and kinetic frictions for plastic ofb xp+km q20-f9oxf .pn wood are 0.50 and 0.40p2+fkq- m9pxbof.0 fx,
respectively. How much horizontal force would you need to apply to a 3.0 N plastic calculator to start it moving from rest?

  An object slides on a level surface in the +x diiz,g4ipj by9 2dn7t7brection. It slows and comes to a stop with a constant acceleration o7ti9pb ,4dn j by2z7gif -$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting on a horizontal surface is pulled by a 5.0-N force. A 3.0ggavg i) ny 0l0h;7inco;4y z1-N friction force retards the motnah 7; y0)z logivc4ig0y;1n gion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.0-y y1 6,8xgezeadi+ukcd.6v1i hwd j37kg mass, from rest, at a rate of $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

  During a hockey game, a puck is given an initial speed of 10 m/s. It slidegz)nw( *q g)dvgv 4ficc3 ;sj2s 50 m on the ice before it stops. What is the coefficient of kinetic fri2i( d jvg 4cf*gc3v)nw )sqz;gction between the puck and the ice?

  During the investigation of a traffic acc)vq6ybye)km l0+s6ed ident, police find skid marks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the prevailing conditions. Estimate the speed of t de6ls0)+e6bvkyy qm) he car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surd w9it.bffr5. j,fy1n wapw,6 face between the more massive box and the horizontal suridj w9 rt,wb,ff5. way6.1fnpface is smooth and the surface between the boxes is rough. If the less massive box does not slide on the more massive box, what is the static friction force on the less massive box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface between .i;qs is-r:(wh0ywa sthe more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less massive box does not slide on (qsy-a w .:ir0hsiw;sthe more massive box, what is the coefficient of static friction between the boxes?

  An object is on a frictio1llypjfn ;/v))aw8.cuxf8w7w xj o+qnless inclined plane. The plane is inclined at an angle o.o8w lpwf jv)x /yj)ac+7nlq x8;1uw ff $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle qzy:m.aii v-9 my3bj9of $10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

  A mass is placed on a smooth inclined plane with an gfr/tu-r+ .ix ;gs+jvangle of $37^{\circ}$ to the horizontal. If the inclined plane is 5.0-m long, how long does it take for the mass to reach the bottom of the inclined plane after it is released from rest?

A block lies on a smooth inclined plane tilted at a3l4c 0u y*k7tdqap1: zhikwtu;mx/q 2n angle of $35^{\circ}$ to the horizontal.
(a) Draw the free-body diagram for the block.
(b) Determine the block's acceleration as it slides down the inclined plane.
(c) If the block started from rest 8.5 m up the incline from its base, determine the block's speed when it reaches the bottom of the incline.
(d) How long did it take the block to reach the bottom of the inclined plane?

  A wooden block slides directly dowox75 jdfn ywu*+b88 kon an inclined plane, at a constant velocity of 6.0 +o87 wj8d 5y*bkxufnom/s.
What is the coefficient of kinetic friction, if the plane makes an angle of $25^{\circ}$ with the horizontal?

  An object with a mass m slides down a rougfzc*w8.e rrci xmr m(,hfp2i k:r91,dh $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass m slides down a rough krhy3ru- rh*.ju0sm( $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. If the plane is 10 m long and the mass starts from rest, what will be its speed at the bottom of the plane?

  A bulldozer drags a log weightq fw.a7r nyx7:c.;xzb8pu( jing 500 N along a rough surface. The cable attached to the log makes an an.7pn:bra(x qu yxf8 j;t7wc.zgle of $30.0^{\circ}$ with the ground. The coefficient of static friction between the log and the ground is 0.500. What minimum tension is required in the cable in order for the log to begin to move?

A 25.0-kg box is released from resrdr (fo pj jc::,-)l)mv1azak t on a rough inclined plane tilted at an angle of,)fjk(lrc1ma z dvjo)-r:: ap $33.5^{\circ}$ to the horizontal. The coefficient of kinetic friction between the box and the inclined plane is 0.200.
(a) Draw the free-body diagram for the box.
(b) Determine the force of kinetic friction acting on the box.
(c) Determine the acceleration of the box as it slides down the inclined plane.

  An object is placed ox e:i6lg+;)l cohwtz0 yu1rx2n an inclined plane. The angle of incline is gradually increased until the6h;1xetw lx+0y 2)u cig:ozrl object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?